This document provides an overview of Joint Service Specification (JSS) 251, a defense documentation standard. JSS 251 standardizes the format, structure and content of technical manuals provided by original equipment manufacturers (OEMs) to the Indian defense forces. The standardization is necessary because multiple OEMs are often involved in complex defense projects, so consistent documentation is needed for operators and maintainers to easily reference. The document outlines what types of documents are typically included, such as user manuals, technical manuals and drawings. It also describes the required sequence and elements of the documentation, such as safety warnings, illustrations and appendices.

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JSS 0251 – Technical Documentation
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Table of Contents
JSS 251............................................................................................................................................1
What is JSS 251?..........................................................................................................................1
Why standardization is needed..................................................................................................2
To name a few documents ............................................................................................................3
Following is the sequence of contents to be followed.................................................................4
What do you need to make our Documents JSS compatible......................................................5
JSS 251
Joint Service Specifications, JSS 0251-01: 2015 (Revision No-2)
What is JSS 251?
JSS 251 is a defence documentation standard. To make it simpler, whenever we buy
some household item, be it a fridge or AC, we get a user manual. If you look closely, each
company follows their documentation structure or pattern and content flow. There will not
be any similarities in formatting or layout. Every OEM has their separate documentation
teams and they design in their way.
Even the size and dimensions of the document may be different.
Similarly whenever a simple system or complex system is delivered to defence users i.e.
Army, navy or air force, along with the original equipment OEMs also has to supply
Manuals.
But, in this Defence suppliers case, the defence wants all the OEMs to follow similar
standards which are defined by them. They want every OEM to follow the document
structure the same way.
These guidelines are drafted in JSS 0251-01: 2015 standards book. Every OEM has to
follow the same guideline while delivering Softcopies and also Hard copies.

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Jss 0251 – Technical Documentation
Why standardization is needed.
Why is this documentation is to be followed?
Well, if it is a deliverable is single AC then no problem. But unlike household equipment,
when defence labs build some equipment for example let us say a Missile, here several
OEMs are involved may be more than 40 different OEMs i.e. for ground systems, Vehicle
chassis, Radars, Power systems, Hydraliques, launchers, transport vehicles and maybe
for components too, so many different vendors are involved. If 40 different OEMs makes
the documentation in their way, it will be very confusing to refer to. Hence all these OEMs
has to follow a single standard JSS 251 so that all 40 looks the same for the operator or
Maintainer who is the actual END-USER of the equipment. The purpose of
documentation is to refer to the Manual in case of any emergency, or when the end-user
is in the war field and OEM is not available for repair then the operator should be able to
refer to the topics very easily.
Normally, all these manuals are also copied in DVD and delivered along with hard
copies.
This specification talks about the procedure for the preparation and production of
technical publications for electronic and electrical equipment.
These standards are drafted by the Directorate of standardization, department of Defence
Production, Ministry of Defence.
JSS 251 describes the format and procedure for the preparation and production of
technical publications for electronics and electrical equipment required to be
supplied by OEMs or manufacturers.

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Along with equipment or subsystem, few technical publications are normally submitted by
OEM to defence lab, or end-user i.e. army, navy or air force.
Joint Service Specifications, JSS 0251-01: 2015
To name a few documents
Design specifications
User Hand Book
Technical Manual
Procurement Drawings
Packing specifications
List of components
List of Carried spares
List of Installation spares
Engineering support package
List of accessories
List of a special tool, test equipment etc…
For simple equipment’s full range of the above-mentioned publications are not required.
UHB and Technical manual can be combined and made into a single document.
Similarly, for complex systems or equipment, there may be more than 1 technical Manual.
There may be TM for every subsystem.
These specifications talk about COVER PAGE designs which include Code Number, Date
of Publication, Title/ Name of publication, Title of equipment and other details
Some equipment may be imported from other countries and the documentation may not
be in the JSS, hence such manuals are to be converted to JSS documents.

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All the text should be in black ink except security classifications & repair /Replacement
instructions on Title & Cover page and also Safety Hazards in the initial pages of manual
The paper used for printing should be 80 GSM or more.
The specification also talks about Descriptive details, Nomenclature, Warnings, Cautions,
List of related publications, illustrations Record of changes, Security Markings etc.
Following is the sequence of contents to be followed.
1. Front/cover page which is printed on thicker paper or laminated
2. The title page which is the same as the Frontpage
3. Record of changes
4. List of other associated handbooks
5. Safety warnings in red colour
6. First-aid instructions
7. Cautions & Notes
8. Demolition instructions
9. Change Notice
10. List of contents
11. List of illustrations
12. Text / content
13. The separate card titled Illustrations
14. Illustrations
15. Sepaarte card titles Appendix “A” , B,C
16. Appendix or appendices
17. Back cover page
Joint Service Specifications, JSS 0251-01 2015 (Revision No-2)

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If the technical Manual has more than one volume then, Volume 1 of 2 the Technical
description
Volume 2 of 2, Illustrations etc to be used
What do you need to make our Documents JSS compatible.
We are not domain experts hence all the raw documents to be provided to us
We will reorganize all the documents as per the prescribed standards
Hence we need
All the raw manuals
Illustrations
Spare- parts details